Honors College Thesis
 

Anammox Enrichment and Kinetics

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https://ir.library.oregonstate.edu/concern/honors_college_theses/8049g725n

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  • Anammox (Anaerobic Ammonium Oxidation) is a significant biogeochemical process carried out by certain bacteria, generally referred to as anammox bacteria. These bacteria have the ability to anaerobically oxidize ammonium (NH4+) with nitrite (NO2-) to form nitrogen gas (N2) without an organic carbon source. While anammox bacteria are found in a variety of environments, their metabolism can be especially useful for ammonium removal in wastewater treatment plants. When compared to conventional nitrogen removal processes, the greatly decreased aeration and methanol requirements significantly reduce cost and greenhouse gas production. This study focused on the enrichment of anammox bacteria from three different sources (wastewater treatment plants in Rotterdam, Netherlands; Virginia, USA; and Oregon, USA) using sequencing batch reactors and up-flow column reactors as enrichment techniques. Anammox activity, monitored by measuring nitrogen species in influent and effluent samples over time, indicated that up-flow column reactors were more suitable for anammox enrichment, and that treatment history of the sludge source affected enrichment at the lab-scale. The first-order substrate removal model, Grau second-order substrate removal model, and modified Stover-Kincannon models were applied to the three anammox up-flow column reactors to describe and predict anammox growth kinetics. Key Words: anammox, enrichment, kinetic models
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